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Class D Switching Power Amplifiers and Power D/A conversion

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Old 16th November 2010, 12:58 PM   #581
norazmi is offline norazmi  Malaysia
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hi dacuycoy,

i`m using ferrite toroid from car amp smps, its typically material 77 i think. this is the best so far for cheap cost i can get, sometimes i get it for free from electronic shops repair here. OD its about 1.3 inch or something i made about 15-18 turns awg 16, no hot at all no noise, big sound.

regards.
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Old 16th November 2010, 05:58 PM   #582
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thanks norazmi, in your recent post you had mention that you used a ferrite toroid with gap, I am confuse if it is an EE toroid or circular toroid. would you mind to post a picture. i want to build this class d amp.

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Dacuycoy
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Old 18th November 2010, 12:31 PM   #583
norazmi is offline norazmi  Malaysia
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Hi Dacuycoy,

There is no EE toroid or u mean EE ferrite core? I`ll take some picture of my lc filter and i`ll post here when ready.

regards.
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Old 19th November 2010, 03:42 AM   #584
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yes I mean EE ferrite core ... tnx can't wait for the picture
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Old 23rd November 2010, 09:57 AM   #585
DJtosa2 is offline DJtosa2  Serbia
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Hi guys, can this amplifier run with IRFP240, i have few peaces... thank you
And can i use L from old PS power supplay, just for testing

Thank you
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Old 23rd November 2010, 10:02 AM   #586
DJtosa2 is offline DJtosa2  Serbia
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Hi guys, can I run this amplifier with IRFP240, I have few pieces?
And can I use L from old PC power supplay, just for testing

Thanks, Regards
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Old 23rd November 2010, 10:08 AM   #587
luka is offline luka  Slovenia
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IRFP240 is bad fet for this kind of amp. why? slow internal diode... but probably will work in the end
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Old 24th November 2010, 09:16 AM   #588
qsa is offline qsa  Germany
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IRFP250N work good, a lot of high power commercial class D amps have it in output stage ... powersoft too

but does somebody know Mosfet with 300 V ratings what is working class D ?

Crest use APT50Wxxxxx in Output stage but hard to get


IRFB Mosfets have only 150 V ratings, cant use for big output power
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Old 24th November 2010, 11:02 AM   #589
Pafi is offline Pafi  Hungary
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Quote:
IRFP250N work good, a lot of high power commercial class D amps have it in output stage
Yes, mostly with tricks to avoid diode conduction! If you can avoid it, then you can use almost anything. I use IXTQ88N30 for example.

Quote:
IRFB Mosfets have only 150 V ratings, cant use for big output power
Haven't you met IRFB4227? (And bridged amplifiers?)
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Old 26th November 2010, 11:26 PM   #590
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Hi everyone,

Well, for reduce noice, I need good output coil, IRFP250 on output or IRF540 for low voltages. C10 of 100pF I change to 2.2nF, from pin 3 of LM311 i put 4.7nF to GND and 5.6K in serial to input. Output capacitor 1.5uF I change to 1uF if output coil is 40uH.

I have all components and tomorow I will build this amp, I plan to use PCB by Lycanlk, but on pcb I add two capacitors of 470uF near by out transistors.

Only problem are output transistors, because i dont have IRFP250, but I have IRFP240PBF, for test i hope they can work

Tell me, is this all corect about changes for reduce a noice what I wrote?

Thank you, Nikola
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